Self-assembly of semifluorinated n-alkanethiols on {111}-oriented Au investigated with scanning tunneling microscopy experiment and theory.
J Chem Phys
; 127(2): 024702, 2007 Jul 14.
Article
em En
| MEDLINE
| ID: mdl-17640140
ABSTRACT
The adsorption of semifluorinated alkanethiols on Au/mica was studied by scanning tunneling microscopy (STM). The adlayer structure produced is based on a p(2 x 2) structure though lines of molecules displayed extensive kinks and bends. In addition, a considerable variation in the contrast of molecular features is found. Molecular modeling calculations confirm that, for the fluorinated thiols, inequivalently adsorbed molecules within a p(2 x 2) registry are present, an aspect that endows the local structure of the adlayer with a higher flexibility in comparison to nonfluorinated thiols, where one adsorption site is strongly favored in a (radical 3 x radical 3) R30 degrees structure. Simulated STM imaging on the optimized systems successfully recovered the effects on the molecular feature contrast induced by the flexibility of the fluorinated thiol adlayer.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
J Chem Phys
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Reino Unido